Scheme of connecting the modem to the AVU. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Scheme of connecting the modem to the AVU. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Telephony

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A diagram of an adapter for a 3-wire AVU output to a normal two-wire output is proposed.

This man-made work does not claim to be original, but nevertheless it really works, unlike circuits based on one relay.

The circuit consists of a handset status analyzer (connected to AVU L1 and L2) and a ringing signal sensor (connected to AVU Zv). The handset state analyzer is configured by a trimmer (upper according to the diagram) so that the output of the corresponding logic element when the handset is off-hook is log. "0". It is necessary to set it up so that the zero on the output is preserved when dialing the number.

The call sensor consists of a pulse shaper (lower left element) and a delay element, its task is to ensure that it does not respond to "bells" when lifting and lowering the handset, only when calling and dialing a number (setting accordingly by the second tuner).

Further, the logic of the circuit is clear, through the "AND" element, which combines both sensors, it is switched on through the transistor relay (I have RES10). On the second transistor, a telephone protection circuit is assembled, which turns off the call signal when the handset is lifted. For the circuit to work, you need a 9-15V power supply and a power supply for the call, (~ 60V changes) I have a transformer with windings for 10 and 60 V.

(click to enlarge)

When reprinting, please do not throw me off the list of authors.

Author: Viktor Naumov; Publication: N. Bolshakov, rf.atnn.ru

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